S --> T: S.val = T.val S --> x: S.val = x.val T --> S+S: T.val = s1.val + S2.val here x and + are letters from the input alphabet, s and T are variables, .val is the attribute denoting the actual valu pression (+ in the attribute meaning addition). hat is the value of the expression x+x+x+x+x, if we know the values for the x-es are 1,2,3,6,15 in order?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Following are the productions of a grammar with attributes:
S --> T:
S.val = T.val
S --> X:
S.val = x.val
- T --> S+S:
T.val = s1.val + S2.val
where x and + are letters from the input alphabet, s and T are variables, .val is the attribute denoting the actual value of the represented
expression (+ in the attribute meaning addition).
What is the value of the expression x+x+x+x+x, if we know the values for the x-es are 1,2,3,6,15 in order?
Select one:
O 27.
O 123615.
O 1.
O 15.
Transcribed Image Text:Following are the productions of a grammar with attributes: S --> T: S.val = T.val S --> X: S.val = x.val - T --> S+S: T.val = s1.val + S2.val where x and + are letters from the input alphabet, s and T are variables, .val is the attribute denoting the actual value of the represented expression (+ in the attribute meaning addition). What is the value of the expression x+x+x+x+x, if we know the values for the x-es are 1,2,3,6,15 in order? Select one: O 27. O 123615. O 1. O 15.
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